How often do you tighten your valve covers and how much?

Rarely, do I tighten the valve covers. I’m just using fel-pro cork style you buy at Napa and a slight bit of RTV on the cover side only - just enough to hold it in place. If I smell a burning oil under the hood, then I check. Typically just an 1/8 turn will do it. If the covers are coming off for valve adjustments then I put new gaskets.